Sash-lock.



` Patented Dec. I9, |899.. A. R. FERGUSSN.

SASH LOCK. (Application fixed June 14,1899.)

(N0 Mo'dl.)

(\ l QN es Q j,... 3""1' (D Q I. l, K lllllllllillll ummm UNITED STATESALAN ROBB FERGUSSON, OF NEW YORK, N. Y., ASSIGNOR TO WILLIAM D.

MAOKEY AND WILLIAM R. ROBBINS, OF SAME PLACE.`

-1 SASH-LOCK.

SPECIFICATION forming part of Letters Patent No. 639,546, dated December19, 1899.

Application led June 14, 1899. Serial No. 720,517. (No model.)

T0 all whom. t may concern;

Beitknown that I, ALAN RoBB FERGUssoN, a resident of New York city, inthe county of New York and State of New York, have invented certain newand useful Improvements in Sash-Locks and Ido hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to an improvement in sash-locks, the object of theinvention being to provide a device of the above-mentioned characterwhich will operate to prevent a window-sash from being opened, but whichwill permit the closing of the sash.

A further object is to provide a sash-lock which will be simple inconstruction, comparatively cheap to manufacture, and most effectualwhen in operation.

With these objects in view the invention consists in certain novelfeatures of construction and combinations and arrangements of parts, aswill be more fully hereinafter described, and pointed out in the claim.

In the accompanying drawings, Figure lis a view in elevationillustrating my improvements. Fig. 2 is a View in longitudinal sectionthrough the locking mechanism. Fig. 3 is a plan View of the frame A,partly in section, with the sashes removed.` Fig. 4 is a detail view ofthe key 22 and disk 2l; and Fig. 5 is a' detail view in section, showingthe plate 28 and socketed plate 30.

A represents a window-frame, and B and O the upper and lower sashesmounted therein. The sashes B and O arereach provided with the ordinaryweights 1 and cords 2 and are adapted to move in guides in the frame, asshown.

The lower sash C is provided on one side edge at its upper end with ametal plate 3, having a series of (preferably three) sockets or pockets4 therein, and the upper sash B is provided on the same side at itslower end with a plate 5, having sockets 6 therein similar to thesockets 4. The frameAis cut out or recessed at one side in proximity tothe plates 3 and 5, and brackets 7 and/8 are secured in said recesses.The brackets 7 and 8 are disposed in different horizontal planes and areprovided on one face with lugs or ears 9, having alined holes thereinfor the reception of a pin 10, by means of which catches 11 arepivotally supported between their ends on said brackets. The catch l1 onthe bracket 7 is provided on its upper end with a tooth 12, beveled orrounded on its lower face, as shown, and a spring 13 is disposed betweenthe catch and bracket to press the toothed end of the catch against theplate 5 on the upper sash and in engagement with the sockets in saidplate. The lower catch 11y is provided on its lower end with a tooth 14,beveled'on its upper edge, and a spring 15 is disposed between saidcatch and the bracket to normally press the toothed end against theplate 3 on the lower sash and in engagement with the sockets in saidplate.

The f brackets 7 and 8 are provided with alined bosses 16, in which anarbor 17 is mounted. Gams 18 are secured on the arbor 17, one beneatheach shortl arm of, the catches 11, and project through slots 19 in thebrackets, and one end` of the arbor 17 projects outward and is madeangular on its outer end and is disposed in a socket 2O in a disk 2l,secured in the frame A. A key 22, comprising a socket-piece 23 toreceive the angular end of the arbor 17 and a yoke 24, pivotallyconnected to said socket-piece, is adapted to be placed on the end ofthe arbor 17 to turn the same. The yoke 24 is provided on one face witha pin 25, and a disk 21 is provided with a socket 26 for the receptionof the pin 25 to hold the arbor in such position as to retain thecatches 11 out of engagement with the sashes, and a spring 27 is securedon the arborv 17 to normally hold the arbor in such position that thecatches 11 will be in engagement with the sashes.

A plate 28 is secured to the upper edge of the lower sash, and saidplate is provided on one edge with a downwardly-projecting beveledfinger 29, adapted, when the sashes are closed, to engage a socketedplate 30 on the lower end of the upper sash to hold the sashes tightlytogether and prevent the entrance of air and rattling of the sashes.

The operation of my improved device is as IOO follows: IVhen the sashesare in their closed position, the catches ll will be in engagement withthe sashes to lock them, and when it is desired to operate either orboth sashes the key 22 is applied to the end of the arbor 17 and thearbor turned to force the cams 18 against the catches to move them outof engagement with the sashes, when the latter can be raised or loweredat will. The pin 25 on the key can now be forced into the socket 26 inthe disk 2l and hold the catches in their unlocked position and permitthe sashes to be raised and lowered without obstruction and be retainedin the position to which they are moved by the counterweights. W'hen thekey is released, the arbor will be turned by the spring 27 to permit thecams to move away from the catches and the latter to engage the plates 3and 5. It will thus be seen that as the catches engage the sashes onlywhen at or near their closed position the catches can be operated tolook the sashes open for the purpose of ventilation, but not far enoughto permit the entrance of a thief, and when the sashes are in thisposition theycan be readily moved to their closed position and will lockautomatically when the lug on the catch springs into a socket in theplate on the sash and prevent any movement of the sash t0- ward its openposition. lVhen the sash is moved so as to bring` the catch out ofengagement with the plate on the sash, the sash can be readily moved upor down and maintained in its position by the counterweights. Thus itwill be seen that my improved device is in no sense a sash-holder, but alock pure and simple.

Various slight changes might be resorted to in the general form andarrangement of the several parts described without departing from thespirit and scope of my invention, and hence I would have it understoodthat I do not wish to limit myself to the precise details set forth, butconsider myself at liberty to make such slight changes and alterationsas fairly fall within the spirit and scope of my invention.

Having fully describedmy invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination with a window-frame and a counterweighted sash, thelatter having pockets in one edge,of a spring-actuated catch mounted inthe sash and cooperating with said pockets to prevent the opening of thesash beyond the catch and permit the free closing of the sash, a cammounted in the frame for withdrawing the catch, a key attached removablyto said cam, said key having a pivoted member provided with a pin and aplate secured to the frame and having a socket for the reception of saidpin.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ALAN ROBE FERGUSSON.

Witnesses:

J OHN MOLEAN, JAS. ',l. BECK.

